diskette drive – A device that enables a computer to read data from and write data to diskettes.
Disk Operating System (DOS) – The generic name for the Microsoft Disk Operating System
DOS – See Disk Operating System.
download – To transfer a copy of a file from a remote computer. Contrast upload.
drive – A device that enables the reading and sometimes writing of data to a storage device. See CD drive, diskette drive, DVD drive, hard drive, Zip drive.
driver – A program that enables the Microsoft Windows operating system and the BIOS to recognize and operate devices installed in or attached to a computer, such as a PCI card or a printer. See Plug and Play.
DSL – See digital subscriber line.
DSL modem – A device used to connect to the Internet using digital subscriber line service through standard telephone lines. See digital subscriber line.
duplex – Describes a communication channel that is always open in both directions. In telecommunications, it refers to the ability of both parties to transmit and receive signals at the same time. Also known as full duplex. Contrast half duplex.
DVD – See digital versatile disc.
electronic mail – A method of sending messages and files across a network or the Internet.
enabling software – An instruction set that must be installed before the associated hardware device can function.
Ethernet – A family of data link protocols that specifies how data is transferred over a network.
expansion slot – A receptacle on the system board that accepts a device that adds functionality to the computer, such as a modem.
Explorer – See Microsoft Internet Explorer, Microsoft Windows Explorer.